Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32395c0fde81b2f…

MALICIOUS

PDF

84.8 KB Created: 2021-03-28 10:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 96eea1dc00b265865485a80e4075f3bc SHA-1: 562998f3df4c7ec7e1f9aab481c6b81d91e06ad4 SHA-256: d32395c0fde81b2f6334bd639abcc3e2136cfebfb7dc4a3a059a8768511e5cbf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/123?utm_term=adobe+photoshop+free++link PDF link annotation
    • http://ibkreactiva2020.com/a_suitable_boy_trailer_netflixhgt8l.pdfIn PDF document text
    • http://xovuwowim.mypressonline.com/remufuzilegupovidu.pdfIn PDF document text
    • http://afracheat6.xyz/wefafuxanaxunubujuvoku5ez98.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/283732319878f8to.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/biblia_de_estudio_reina_valera.pdfIn PDF document text
    • http://itawegan.space/lijofogejorulaxakujopafejyd250.pdfIn PDF document text
    • http://gufutaca5.xyz/carestation_620_service_manualkwzmk.pdfIn PDF document text
    • http://bajesiradevo.getenjoyment.net/bangla_english_grammar_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_9dbf15ccc97348b2a3e703619e115e3e.pdf?index=trueIn PDF document text
    • http://xaligapuk.epizy.com/nevumetuta.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_3bdbcb095b9d4826ac0ef4f68c19f929.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_f9ff049891b64a20b6c9e13b77caaa2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afbe796a-42a8-439a-b9e3-07fa301ab56b/black_boy_haircuts_designs.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_65c30a41990b428f8052696044d62a66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23196b5a-6e95-4eff-bc1a-2dbc40df7159/purizatujakoxugijalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187eba98-ad62-4358-950f-1ddb9b081ff9/precision_sewing_machine_vintage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a824d7a-cd48-42bd-841e-2ef4cd3e20f4/vusujezefizomewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5790b1ac-93aa-4d23-8d19-9384900ec0c9/deepak_chopra_21_days_of_abundance_day_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e6cea1-dadf-47e6-883e-9e1a8f4336be/12281645389.pdfIn PDF document text
    • http://poborunedajemo.onlinewebshop.net/98931939441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f65703-4da6-434c-a450-e8ce8e4835a5/20327664113.pdfIn PDF document text
    • http://fonufusova.rf.gd/a_moveable_feast_free_download.pdfIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_cdaa721c0f4b4667bd0c04adf3606ad4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4884ee2-4ea0-4a24-b613-b53218c78835/69481259366.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/winojarufiseno.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 5112 bytes
SHA-256: c0d7b33386080f626b548b85800b803b8739ade9b6fbbe9d56f8839d0363be60
font_01_sfnt_off000120b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 10888 bytes
SHA-256: dc92a271e0ea036007b0bef7150e463cfce1d9a97af5b627c306aeab94b7dc9c